Impulse Sound. Either a single pressure peak or a single burst (multiple pressure peaks) for a duration of less than one second as measured on a peak unweighted sound pressure measuring instrument or “C” weighted, slow response instrument and specified by dB and dBC respectively.

Noise Level. Weighted sound pressure level measured by use of a metering characteristic with an “A” frequency weighting network and reported as dBA.

Noise Sensitive Building. A building on a noise sensitive property that is used as a residence, school, church, hospital, or public library.

Noise Sensitive Property. Property located within the Eugene city limits that is zoned for residential use, schools, churches, hospitals or public libraries.

Octave Band Sound Pressure Level. The sound pressure level for the sound being measured within the specified octave band. The reference pressure is 20 micropascals (20 micronewtons per square meter).

One-Third Octave Band Sound Pressure Level. The sound pressure level for the sound being measured within the specified one-third octave band at the preferred frequencies. The reference pressure is 20 micropascals (20 micronewtons per square meter).

Person. An agent, occupant, lessee, tenant, contract purchaser, or other person having possession or control of property or the supervision of an activity on the property that produces noise.

Preferred Frequencies. Those mean frequencies in Hertz preferred for acoustical measurements which for this purpose shall consist of the following set of values: 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000, 10,000, 12,500.

Sound Pressure Level (SPL). 20 times the logarithm to the base 10 of the ratio of the root-mean-square pressure of the sound to the reference pressure. SPL is given in decibels (dB). The reference pressure is 20 micropascals (20 micronewtons per square meter).

(a) Blasting. 98 dBC, slow response, between the hours of 7 a.m. and 10 p.m. and 93 dBC, slow response, between the hours of 10 p.m. and 7 a.m.

(b) All Other Impulse Sounds. 100 dB, peak response, between the hours of 7 a.m. and 10 p.m. and 80 dB, peak response, between the hours of 10 p.m. and 7 a.m.

(a) No person owning or controlling an industrial or commercial noise source shall cause or permit the operation of that noise source if such operation generates a median octave band sound pressure level which, as measured at an appropriate measurement point, specified in subsection (4) of this section, exceeds applicable levels specified in Table EC 6.752(5).

(b) One-third Octave Band. No person owning or controlling an industrial or commercial noise source shall cause or permit the operation of that noise source if such operation generates a median one-third octave band sound pressure level which, as measured at an appropriate measurement point specified in subsection (4) of this section, and in a one-third octave band at a preferred frequency, exceeds the arithmetic average of the median sound pressure levels of the two adjacent one-third octave bands by:

(c) This section shall not apply to audible discrete tones having a one-third octave band sound pressure level 10 dB or more below the allowable sound pressure levels specified in Table EC 6.752(5) for the octave band which contains such one-third octave band.

(a) In the application of this code section, the city will use sound measurement procedures that conform to those procedures set forth in Sound Measurement Procedures Manual (NPCS-1), or to such other procedures administratively adopted by the city manager.

(b) Unless otherwise specified, the appropriate measurement point shall be the point on the noise sensitive property set out in 1. or 2., below, whichever is further from the noise source: